Kenny spontaneously combusts. The mayor asks Randy Marsh to find a solution. The boys try to help Kyle's dad to get an erection. One way they think they can help is by performing the Stations of the Cross at church crucifying Cartman and waiting three days for his res-erection. Randy Marsh figures out the reason everyone is combusting is because they are withholding their farts.

When I was younger, I was at a Boy Scout Jamboree in the Sierra Nevada Mountains. I was so gassy; it now makes me think of that incident and Spontaneous Combustion. While I didn't combust of course, I ripped one so loud that everyone pointed their flashlights at me I couldn't get out of it. I tried looking at someone else as if they did it instead. My plan did not work. It was so embarrassing

Omg. I just noticed that toward the end of the ep, when Gerald is cured of his hydrolic problem, he's sporting a quite massive hard on as he crosses the screen as he tells Kyle that he "has something for your mother". I can't believe they showed that on broadcast TV, even at 12:45 at night.